Pacific Standard Time (PST) is also known as Pacific Time (PT),
Pacific Coast Time. Pacific Standard Time is observed
in the Pacific Coast of United States, Canada, and Baja California Norte of Mexico in Winter. Those regions
will observe Pacific Daylight Time (PDT) in summer.

Except those regions that use PST all year long, PST starts at 2 AM on the first Sunday of November each year, turn the clock 1 hour back to 1 AM at that time,
and PST ends at 2 AM on the second Sunday in March each year, turn the clock 1 hour forward to 3 AM at that time.